these were originally russian-made systems sold to syria. they are very sophisticated, something called the sa-17. they were designed to protect russian military bases icbm systems or russian cities from attack by u.s. and nato forces. they are mobile systems and easily camouflaged. for months we're reporting how iran is clandestinely resupplying syria, weapons, men, equipment during the civil war using unregistered cargo planes applying flying into syrian airports and offloading their cargo. we know what is going back to iran on the cargo planes. western intelligence sources confirming to us that the sa-17s are being loaded on flown back to iran. not only do they get back to iran they have sa-17s, iranians are sophisticated taking them apart, reverse engineering them and building more. the plans to attack iran's nuclear facilities by the united states or israel did not take into account the idea these facilities would now be protected by the sa-17s, changing a lot now here in the middle east, jenna. jenna: a story we'll continue to watch, l